Shells of Paphia undulata (Bivalvia) from the South China Sea as potential proxy archives of the East Asian summer monsoon: a sclerochronological calibration study

2013 ◽  
Vol 70 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Lina Yan ◽  
Bernd R. Schöne ◽  
Shengrong Li ◽  
Yan Yan
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
The South China Sea ◽  
China Sea ◽  
Asian Summer ◽  
Calibration Study

Late Quaternary Upwelling Intensity and East Asian Monsoon Forcing in the South China Sea

2001 ◽  
Vol 55 (3) ◽  
pp. 363-370 ◽  
Author(s):  
Zhimin Jian ◽  
Baoqi Huang ◽  
Wolfgang Kuhnt ◽  
Hui-Ling Lin
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
The South China Sea ◽  
Asian Summer ◽  
Mis 5

AbstractForaminifera from two cores off eastern Vietnam and the northwestern Philippines, where modern summer and winter monsoon-driven upwelling occurs in the South China Sea, respectively, were analyzed to evaluate the changes in paleoproductivity and upper water structure over the last 220,000 yr. We observed enhanced organic carbon flux and a shoaled thermocline when upwelling intensified off eastern Vietnam during interglacial ages and off the northwestern Philippines during glacial ages. This indicates that the East Asian summer monsoon increased while the winter monsoon decreased during interglacial ages. Particularly, the upwelling reached a maximum off eastern Vietnam during late marine isotopic stage (MIS) 5 and off the northwestern Philippines during MIS 2, implying that the summer monsoon decreased gradually since MIS 5 while the winter monsoon displayed an opposite trend. The variations in upwelling proxies exhibit a distinct cyclicity with frequencies near 41,000 yr and 23,000 yr off eastern Vietnam, in contrast to a strong frequency peak near 100,000 yr off the northwestern Philippines. We suggest that the East Asian summer monsoon has been forced by changes in solar insolation associated with precession and obliquity, while ice-volume forcing is probably a primary factor in determining the strength and timing of the East Asian winter monsoon but with less important insolation forcing.

scholarly journals Impact of the Summer Monsoon Westerlies on the South China Sea Tropical Cyclone Genesis in May

2017 ◽  
Vol 32 (3) ◽  
pp. 925-947 ◽  
Author(s):  
Tsing-Chang Chen ◽  
Jenq-Dar Tsay ◽  
Jun Matsumoto ◽  
Jordan Alpert
Keyword(s):  
South China Sea ◽  
Shear Flow ◽  
Summer Monsoon ◽  
South China ◽  
Asian Summer Monsoon ◽  
The South China Sea ◽  
Monsoon Circulation ◽  
Forecast System ◽  
China Sea ◽  
Asian Summer

Abstract After the onset of the Southeast Asian summer monsoon in mid-May, the South China Sea (SCS) trough is deepened by the intensified monsoon westerlies to facilitate the development of a synoptic cyclonic shear flow. This shear flow forms an environment favorable for the SCS tropical storm (TS)/typhoon (TY) genesis triggered by the surge of this monsoon circulation. This genesis mechanism has not been well documented. Seventeen named SCS TS/TY geneses in May over 1979–2016 occurred under the following environmental conditions/processes: 1) with its maximum located south of 15°N, the intensified monsoon westerlies are extended eastward beyond 120°E, 2) the synoptic SCS cyclonic shear flow is developed by the tropical easterlies fed by a northeast Asian cold surge (or a North Pacific cold-air outbreak) and the intensified monsoon westerlies, and 3) SCS TS/TY genesis is triggered by the surge of monsoon flow. The accuracy of the monthly mean forecasts is limited. However, it is found that SCS TS/TY genesis only occurs after the existence of persistent, strong, monsoon westerlies lasting for at least 5 days. Forecasts from the National Centers for Environmental Prediction Global Forecast System (2004–16) and the Global Ensemble Forecast System (1985–2003) cover these 15 SCS TS/TY geneses. The requirements for SCS TS/TY genesis in May described above are met by the 5-day-mean Southeast Asian summer monsoon circulation. Based on a statistical analysis of 5-day forecasts for these TS/TY geneses, a four-step forecast advisory is introduced. The forecasts for SCS TS/TY genesis can be made 3 days prior to occurrence.

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